| China Mobile Multimedia Broadcasting (CMMB) is popular with policy and market because of its improved technical specifications, fluent communication signals and ownership of property rights. CMMB signal has covered 331 prefecture-level cities and 36 of the top 100 towns. The number of users has reached millions and related industries are constantly perfected. China Broadcast Corporation (CBC) cooperates with China Mobile to promote CMMB. China Mobile uses MBBMS (Mobile Broadcast Business Management System) as the mobile TV business management system. This article will introduce CMMB technical characteristics, physical frame, the frame multiplexing and embedded operating system RTK-E (Real Time Kernel OS), and then discuss the realization of CMMB software in data card.MBBMS contains the CMMB charging function and adopts four key structures of CMMB standard. According to the characteristics of SMS1185, Advanced Encryption Standards (AES) and Program Stream Key (MTK) are used to decrypt program stream in four key structures in data card. These articles describe the production process of AES algorithm, mathematical foundation, the link mode, finally gives AES decryption algorithm under the current network conditions and realization of it with the C language. |
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